Magnetic Impurities in Nonmagnetic Metals

Possible origin of the nonmonotonic doping dependence of the in-plane resistivity anisotropy of Ba(Fe1−xTx)2As

“…∆ρ/ρ scales approximately with B/ρ. As was first shown by Abrikosov, a linear band dispersion can lead to a linear MR in the quantum limit [35][36][37] . In the case of BaFe 2 As 2 , the linear MR could be naturally explained by the presence of Dirac pockets in the AFM reconstructed state due to the symmetry protected band crossing 38 .…”

Magnetoresistance in Two-Component Systems

“…Classical linear MR has been predicted by Azbel for a three-dimensional metallic slab with smooth boundaries [25,26]. Quantum linear MR has been found by Abrikosov [27] for Dirac fermions in compensated semimetals in the extreme limit, ω c ≫ T (only one Landau level is filled), which is not reached in most measurements (here, ω c is the cyclotron frequency, T is the temperature, and ℏ ¼ k B ¼ 1). In weak magnetic fields the linear behavior may also be associated with quantum interaction corrections [28,29] or with the classical "corridor" effect [30].…”

Controlled formation of high-mobility shallow electron gases in SrTiO3single crystal

“…22) Abrikosov's quantum magnetoresistance, however, requires either only the lowest Landau level to be partially occupied 20) or an effective linear energy dispersion relation near the Fermi level, 21) neither of which is met by our samples (see the Supplementary data). Therefore, another explanation by disorder-or inhomogeneity-induced linear MR would be more plausible.…”

“…Occurrence of large linear MR is usually explained in terms of quantum magnetoresistance 20,21) or mobility disorder. 22) Abrikosov's quantum magnetoresistance, however, requires either only the lowest Landau level to be partially occupied 20) or an effective linear energy dispersion relation near the Fermi level, 21) neither of which is met by our samples (see the Supplementary data).…”